Writing aid



FIG. 1 is a perspective view of a writing aid showing a new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof; and,

FIG. 4 is a perspective view of the writing aid of FIG. 1 in use.

The dashed lines are included for the purpose of illustrating portions of the writing aid that form no part of the claimed design. 

CLAIM The ornamental design for a writing aid, as shown and described. 